JPS62260637A - Safety device for packer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a safety device for a packaging device for wrapping an object with a film.

[Prior art]

2. Description of the Related Art Various packaging devices have been developed for wrapping articles stored in a tray made of styrofoam, plastic, or the like with a stretch film. Among these packaging devices, there is one that uses a butcher knife conveyor as the packaged article carrying mechanism of the packaging machine.

FIG. 2 is a longitudinal sectional view showing the packaging machine portion of the packaging device. The packaging machine 100 includes a carry-in mechanism 1 for carrying in items to be packaged.
10 - Elevator mechanism 120 for pushing the packaged items carried in by the carry-in mechanism 110, packaging film 11 transfer mechanism 130, film folding mechanism 140, unloading mechanism 150 for carrying out the packaged articles, and packaging machine 100 is provided.

The carry-in mechanism 110 includes a pusher conveyor 118 having a structure in which pusher plates 111a and 111b are attached to an endless chain 117 stretched between sprockets 112a and 112b.
and a belt conveyor 113 disposed continuously with the butcher conveyor 118.

A weighing device 114 is provided at the center of the butcher conveyor 118 for weighing the items to be packaged. The measuring instrument 1
14 is arranged so that its weighing pan 114a is located on the same plane as the carrying-in surface.

The item to be packaged is placed on the weighing pan 114a of the weighing device 114,
A signal is output from the weighing device 114, and when the weighing signal becomes stable, power is obtained from the power unit 160 and the butcher conveyor 118
Then, the belt conveyor 113 is started, and the object to be packaged is pushed by the pusher conveyor 11B(7)/sushi plate 111a and delivered to the belt conveyor 113J-. The belt conveyor 113 further transports the object to be packaged, and the object to be packaged is transferred to the elevator head section 121- of the elevator mechanism 120.
At 1=, it comes into contact with the stop plate 101 and stops. Then, by placing the next item to be packaged on the weighing pan 114a, the weighing pan 1
When the weighing stability signal from 14 becomes stable, the elevator mechanism 120 moves up 1/2, and the object to be packaged on the elevator head 121 rises 1/2, is transferred by the film transport mechanism 130, and is stretched to the lower part of the film folding mechanism 140. It is pressed onto a film that has been cut to a predetermined length. In the film folding mechanism 140, the film L that covers the packaged object pushed up by the film 11 is inserted into the left and right folding plates 141, the front folding plate 142, and the U-output pushers ~14.
By the operation 3, the packaged object is folded into the bottom part and at the same time, it is carried out of the packaging machine 100 by the carrying-out mechanism 150.

The drive control for each operating section of the packaging machine 100 is provided in the power section 160, and is controlled by a motor 162 and a speed reducer 163.
This is based on a timing signal generated by a timing disk 161 that rotates in synchronization with the timing disk 161.

In the packaging machine 100 configured as described above, if an item to be packaged falls over at or near the elevator head 121J, the operator should insert his/her hand through the loading port 115 of the loading mechanism 110 and remove the tray and its stored items. There is.

[Problem that the invention seeks to solve]

- If the packaged item topples on or near the elevator head 121 as described in (h), press the designated switch (emergency stop switch) to stop the packaging machine, and then insert your hand through the loading port 115. The tray and its contents are removed, but if the operator forgets to press the above switch or the packaging machine does not stop due to a malfunction of the switch, part of the operator's clothing or body may be removed from the weighing plate. 114a, a weighing signal is generated by the weighing device 114, and
5. When it is determined that this weighing signal is in a stable state, the butcher conveyor 11B of the carry-in mechanism 110 is activated and starts carrying in the packaged items. As a result, the operator's arm or the like may be drawn into the packaging machine 100 by the bushing conveyor 11B and lifted upward by the elevator head 121, resulting in an accident.

The present invention has been made in view of the above-mentioned points. □If a packaged object falls on or near the elevator head 121, the operator may forget to press the permanent stop switch 41 or the switch may be malfunctioning. Another object of the present invention is to provide a safety device for a packaging machine that automatically detects the presence of an object other than an object to be packaged at the entrance 115 and prohibits and/or stops the packaging machine 100 from starting.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a packaging apparatus in which an article to be packaged is conveyed into a packaging apparatus through an inlet by a conveyor mechanism such as a bumper conveyor, and the article to be packaged is wrapped in a film. A sensor is provided at or near the opening to detect an object entering the loading port, and an output signal from the sensor is used to prohibit the activation of the loading mechanism and/or to prevent the loading mechanism from starting if an object other than the packaged item enters the loading port. A stopping means is provided to stop the operation.

[Effect]

With the above configuration, if there is an object other than the packaged item at the loading entrance, the control means prohibits the activation of the loading mechanism and/or stops the operation, so if you forget to press the emergency stop switch, your arm, etc. Even if the person enters through the delivery entrance, it is possible to prevent accidents such as the arm being pulled in by the butt conveyor.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing a system configuration of a control section of a packaging apparatus according to the present invention. In the figure, 11 is a central processing unit;
12 is a ROM (read only memory) that stores various programs, etc.; 13 is a RAM (random access memory) that stores control data, etc.; 14 is an operation unit provided with the emergency stop switch and various operation switches; and 15 is a packaging. A display unit displays various information such as the status of the device and the name of the product to be packaged; 16 is a buzzer that issues an alarm when an object other than the product to be packaged is present at the entrance 115 of the packaging machine 100; 17 is the buzzer 16; 19 is an input/output control circuit (Ilo); 20 is a loading port 115 of the packaging machine 100;
Alternatively, it is an entrance article detection sensor installed near the entrance. Further, the input/output control circuit 19 receives a timing signal from the timing disk 161 and a weighing signal from the scale 114, and furthermore, from the input/output control circuit 19, a signal line j2. A signal line that transmits control signals to the packaging device name drive control unit (not shown)! ,・
...p is connected.

The inlet article detection sensor 20 is a transmission type object detection sensor composed of a light emitting element 20a and a light receiving element 20b, and as shown in FIG. 2 and FIG. 100 in the vicinity of both sides of the loading port 115, light is emitted from the light emitting section toward the light receiving section across the loading port 115, and the presence of the object is detected by blocking the light. It is a sensor.

In the control unit of the packaging apparatus configured as described above, when the inlet article detection sensor 20 detects the presence of an object at the inlet 115 and sends the detection signal to the central processing unit 11 through the input/output control circuit 19, the central processing The device 11 determines whether the object is an object to be packaged or not using a method described later, and if it is other than an object to be packaged, it stops the operation of each operating section via the input/output control circuit 19, and also stops the operation of the buzzer control section. 17, and the buzzer 16 issues an alarm.

FIG. 3 is a diagram showing the relationship between the position of the pusher A/plate 111a in the carry-in mechanism 110 of the packaging device 1100, the time at that time, and the rotation angle α of the timing disc 161. In this figure, parts given the same reference numerals as those in FIGS. 1 and 2 indicate the same or equivalent parts. 1lla-1,1ll
a-2, 1lla-3, 111a-4, the bumper plate 111a of the bumper conveyor 118 constituting the carry-in mechanism 110 of the packaging machine 100 shown in FIG.
1 is 0°, 80', 100', 24 respectively
The state when rotated by 0° is shown, and L indicates the vertical width of the packaged object Tj2, which has the maximum vertical width that can be wrapped. As can be seen from this figure, the time t after the packaging machine starts operating and the butcher conveyor 11B starts is tl<t<j* (that is, the rotation angle α of the timing disc 161 is too''< α
<240' period), there is a possibility that the packaged object TN crosses the inlet article detection sensor 20. Therefore, if something crossing the detection sensor 20 is detected outside of this period, it can be determined that it is something other than the object to be packaged.

Therefore, the first embodiment of the present invention has a configuration that meets the following requirements.

■When the weighing signal becomes stable and the packaging machine 100 starts operating,
When the inlet article detection sensor 20 detects an object, the packaging machine 100 is prohibited from starting, and the packaging machine 100 starts operating, the butcher conveyor 118 starts, and starts carrying in the packaged items. Even after the time t from the start of operation is 0≦
A period of t≦t (the rotation angle of the timing disk 161 is 0)
If the carry-in 11 article detection sensor 20 detects an object during the period of ≦α≦80'', the operation of the packaging machine 100 is stopped and the butcher conveyor 11B is stopped.

Note that in the above, the period t' (i.e. 1.<1'<tz
) is the maximum vertical width of the packaged object T! carried in by the bumper plate 111a! This margin is provided in consideration of the case where the orientation of the container is inclined with respect to the loading direction.

Furthermore, in the second embodiment of the present invention, the following requirements are added to the requirements (1) and (2) above.

■The packaging machine 100 starts operating and the packaging conveyor 11
8 is started, the time t from the start of operation is a period of t≧ (
When the rotation angle α of the timing disc 1610 is α≧2406), when an article is detected at the inlet entrance (if the sensor 20 detects an object, the operation of the packaging machine 10'0 is stopped and the butcher conveyor 118uF11- !

In the first embodiment, the reason why the packaging machine 100 was not configured to stop the operation of the packaging machine 100 even if the inlet article detection sensor 20 detects an object when the time t≧t3 is that the button board 111a has already passed through the carry-in port 1-1115, even if you insert your arm into the carry-in port 115, there is no need to worry about your arm being pulled in by the pusher plate 111a. This is because since the starting force is prohibited, there is no need to stop the operation of the packaging machine 100. The control flowchart of the above embodiment will be explained below.

FIG. 4 is a flowchart showing 4-control that satisfies the above requirement (2). When the object to be packaged is placed on the weighing pan 114a of the weighing instrument 114 and the weighing signal from the weighing instrument 114 becomes stable, the above process (2) is started (step 5TI). First, it is determined whether or not the inlet article detection sensor 20 is detecting an object (step 5T2). If it is, there is an object other than the object to be packaged at or near the inlet +1115, so the object is not detected on the conveyor. 118 and the carrying-in mechanism 110 consisting of the bell 1 to the conveyor 113 is not activated and a signal is sent to the buzzer control unit 17 to issue an alarm with the buzzer 16 (step ST4'), and the process returns to the main processing routine (step 5T5). In the step ST2,
If the carry-in entrance article detection sensor 20 does not detect an object, the carry-in mechanism 110 is activated (step 5T3), and the process returns to the main processing routine (step 5T5).
. FIG. 5 is a flowchart showing control that satisfies the requirements of item 2 (2). In the figure, the process is started when the carry-in port article detection sensor 20 detects an object while the carry-in mechanism 110 is activated (step 5TIO). First, it is determined whether or not the rotation angle α of the timing disk 161 is O''2α≦80° (Step 5T11). If yes, the article detection sensor 20 at the loading entrance detects an object other than the article to be packaged. Therefore, the loading mechanism 110 is stopped (step ST, 12), a signal is sent to the buzzer control unit 17, and an alarm is issued by the buzzer 16 (step 5T13), and then the process returns to the main processing routine (step 5T).
14). If the answer is NO in step STI 1, the process returns to the main processing routine without doing anything (step 5T14).

FIG. 6 is a flowchart showing control when processing is performed by adding the requirement (2) to the requirement (2) in -F.

-12= In the figure, the process is started when the carry-in 1'' article detection sensor 20 detects an object while the carry-in mechanism 110 is activated (step ST20). First, it is determined whether or not the rotation angle α of the timing disk 161 is 0″≦α≦80° (step 5T21). If yes, the article detection sensor 20 at the loading entrance detects an object other than the article to be packaged. Therefore, the loading mechanism 110 is stopped (step 5T1).
22) and sends a signal to the buzzer control unit 17 to turn off the buzzer 1.
After issuing a warning in step 6 (step 5T23), the process returns to the main processing routine (step ST24).

In step 5T21, the timing disk 161
If the rotation angle α of the timing disk 161 is not 0°≦α≦80″, then it is determined whether the rotation angle α of the timing disc 161 is 240m≦α (step 5T25), and if YES, the article is detected at the loading entrance. Since the sensor 20 has detected an object other than the packaged object, the process moves to the process of stopping the carrying mechanism 110 as described above (step ST22).If the answer is no, the process returns to the main processing routine without doing anything. The process moves to return processing (step ST24).

FIG. 7 is a diagram showing the overall structure of the packaging device, in which FIG. 7(a) is a plan view, FIG. 7(b) is a front view, and FIG. 7(c) is a side view. A labeler 210 is placed above the delivery mechanism 150 of the packaging machine 100, a conveyor 201 is placed at the tip of the delivery mechanism 150, and the conveyor 201 reverses the transported packaged articles in a right angle direction. At the tip of the roller conveyor 202, a transfer conveyor 203 inclined at a predetermined angle is disposed at the tip of the roller conveyor 202. The labeler 210 writes the product name of the packaged item on a blank label.
The unit price, weight, price, etc. are printed on the label, and the printed label is affixed to the top surface of the packaged article by blowing it on.

-)- To explain the normal operation of the packaging device for structural acid, when an item to be packaged is placed on the weighing pan 114a disposed in the loading area of the packaging machine 100, the old weighing device 114
generates a weighing signal, and when this weighing signal becomes stable, the carry-in mechanism 110 consisting of the bushing hair 118 and the belt conveyor 113 is activated and carries the packaged items onto the elevator head 121 as described above. Next, the measuring pan 114a
When the object to be packaged is placed on L: and the weighing signal becomes stable, the object to be packaged is pushed up by the elevator mechanism 120, and the film is folded into the bottom of the object by the film folding mechanism 140. The packaged article wrapped with a film is transferred to the lower part of the labeler 210 by a carry-out mechanism 150 or the like. Here, it is positioned at a predetermined position by a width board (not shown), and a label with information such as ]:, product name, price, weight, price, etc. be carried upwards. The transport conveyor 201 is arranged in a direction perpendicular to the direction in which the packaged articles are carried out, and the packaged articles carried out onto the conveyor conveyor 201 are carried in that direction and carried out onto the roller conveyor 202. The roller conveyor 202 is the same as the conveyor 20.
In order to transfer the packaged article to the transfer conveyor 203 disposed perpendicularly to the conveyor 203, the packaged article is reversed by 90 degrees and transferred onto the transfer conveyor 203. As a result, the packaged articles naturally fall on the transfer conveyor 203 and descend to the packaging machine 10.
The packaged article is transported to the vicinity of the article carrying-in portion at No. 0. At the tip of the transfer conveyor 203, a container or the like for accommodating the packaged article is arranged, and the packaged article is housed in the container.

Further, in the figure, 170 is an operating section of the packaging machine 100, and 220 is an operating section of the weight value marking machine (FIG. 1 includes the operating section 170 and the operating section 220). The operation section 170 is equipped with an emergency button switch 221 that stops the operation of the packaging machine 100 in case of an emergency, and the operation section 220 has buttons for inputting various data such as product name, unit price, packaging, weighing, and pricing. Push button switches etc. are well placed.

In the packaging device described above, an operator is located near point A in FIG. 7(a), and by operating the device, a series of operations such as weighing, packaging, and pricing of the packaged items stored in a tray or the like is performed. This means that a single operator can perform the following tasks: packaging, weighing,
Pricing work can be greatly reduced. Elevator head part 1
If the packaged item falls on or near 21 or packaging fails, the operator usually presses the emergency button switch 221 on the operating section 170 of the packaging machine 100 to stop the operation of each operating section of the packaging device. and remove the tray and its contents. In this case, for some reason, the operator forgets to press the emergency button switch 221 and does not stop the operation of each operating part of the packaging machine. (There is a risk that the operator forgets to press the switch 221), the operator inserts his/her hand through the loading port 115, and if the scale 114 is pushed by the operator's body, etc., the scale 114
When the weighing signal is determined to be stable, the butcher conveyor 11B and the belt conveyor 1
13 is started. When the butcher conveyor 118 is activated, the arm of the operator near the entrance 115 may be pulled in by the butcher plate 111a or 111b, causing an accident such as injury.

However, in the above embodiment, the loading port article detection sensor 20 is arranged near the loading port 115 as described above, and the output signal from the loading port article detection sensor 20 is processed by the central processing unit 11. If an object exists near the loading port 115, the above-mentioned accident can be prevented by prohibiting the loading mechanism 110 from starting and/or stopping its operation. In the above embodiment, the article detection sensor 20 at the entrance is placed near both sides of the entrance 115, as shown in FIG. 2 and FIG. The sensor has a structure that detects the presence of an object by emitting light across the loading port 115 and blocking the dazzling light, but the loading port article detection sensor 20
is not limited to this, for example, the light emitted from the light emitting section may be arranged so as to diagonally cross the entrance 115 and reach the light receiving section. Further, the sensor is not limited to an optical sensor consisting of a light emitting part and a light receiving part, and any sensor having any structure may be used as long as it can detect an object present near the entrance 115. In addition, in the case of the above embodiment, since the packaging machine 100 is a weighing, packaging, and pricing machine configured in combination with a weighing and value marking machine, the packaging machine 100 is started when the weighing signal becomes stable. However, the present invention is not limited to such a configuration, and the packaging machine 100 may be activated by a detection signal from a microswitch that detects that an item to be packaged is placed on the carry-in mechanism 110. Needless to say, it is fine even if it is possible.

In addition to the above-mentioned embodiment, it is also possible to add a configuration having the following functions to further complete safety measures by using the inlet article detection sensor 20.

(a) The state when the packaging machine 100 is started, that is, the weighing pan 114
When the article to be packaged is placed on the container a, the weighing signal is stable, and the operation can be started, if the article detection sensor 20 at the loading entrance detects an object, the buzzer 1G will sound an alarm at the time of detection.

(B) Furthermore, the packaging machine 100 is usually equipped with various abnormality detection sensors, and the apparatus is configured to automatically stop when an abnormality is detected by these sensors. In order to cancel this abnormal state, it is necessary to insert your arm through the loading port 115 to deal with the abnormal state (for example, double trays when two foamed items are detected on the elevator head 121, film If the device is stopped due to an over-film that is not used to package the packaged item normally), the emergency stop will be canceled unless the article detection sensor 20 at the loading entrance detects an object at least once. Even in such a case, the packaging machine 100 is prohibited from returning to the operating state and a warning is issued by the buzzer 16. This prevents the apparatus from being started again without the cause of the abnormality being removed.

〔Effect of the invention〕

As explained above, according to the present invention, a sensor is provided at or near the loading entrance to detect an object entering the loading opening, and the output signal of the sensor detects whether an object other than the packaged object has entered the loading opening. If there is an object other than the packaged item at the loading port, the control means prohibits the loading mechanism from starting and/or stops its operation. Even if you forget to press the emergency stop switch and your arm or the like enters through the delivery entrance, an excellent effect can be obtained that can prevent an accident in which the arm is drawn in by the bushing conveyor.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the system configuration of the control unit of the packaging device according to the present invention, FIG. 2 is a longitudinal sectional view showing the packaging machine portion of the packaging device, FIGS. 3, 4, 5, and 6. The figure is a flowchart for explaining the control in the embodiment, and FIG. 7 is a diagram showing the overall structure of the packaging device, in which figure (a) is a plan view, figure (b) is a front view, and figure (c) is a diagram showing the overall structure of the packaging device. is a side view.

Claims (3)

[Claims] (1) In a packaging device in which an item to be packaged is carried into the packaging device through an inlet by a carry-in mechanism, and the carried object is wrapped in a film, an object that enters the inlet at or near the inlet In addition to providing a sensor for detecting this, a control means is provided which prohibits the activation of the carrying-in mechanism and/or stops the operation of the carrying-in mechanism when an object other than the packaged object enters the carrying-in entrance based on an output signal of the sensor. A safety device for packaging equipment characterized by: (2) As described in claim (1), the control means includes means for stopping the operation of the carry-in mechanism when a sensor detects an object within a predetermined time after starting the packaging device. safety equipment for packaging equipment. (3) The control means is a means for stopping the operation of the carry-in mechanism when a sensor detects an object at a time other than a set time after starting the packaging device. Safety device for packaging equipment.